JPH0569431B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a display unit that displays characters and characters by arranging display elements such as light emitting diodes in a matrix.

[Conventional technology]

Neon signs have been used for a long time to display specified content using shapes and colors, but recently, dot display units have been used using light-emitting diodes, discharge lamps, etc. to selectively light up the dot display unit.
Display devices that turn off are becoming popular. Since the displayed content can be changed by turning on/off each dot, neon signs do not have a specific shape or color like neon signs, but can display letters, patterns, and other characters freely. has no great advantages. Therefore,
Dynamic displays can be freely performed, such as advertisements, lightning news, etc.
It can be effectively used for message display, guidance, etc.

[Problem that the invention seeks to solve]

By the way, neon signs have traditionally been used for advertising purposes by lighting up at night and displaying specific content, but matrix display devices can freely display characters such as letters and patterns. Lightning news, message display,
Since they can also be used for guidance, etc., they are becoming actively used not only at night but also during the day. However, as usage patterns during the day become more diverse, the weakening of display contrast due to the brightness of sunlight becomes a major problem that cannot be ignored. In particular, when the sunlight is strong, the sunlight is reflected on the display element and its surroundings, and the brightness of the area around the display element becomes the same as the brightness when the display element is turned on. Therefore,
The displayed content becomes almost invisible, the display effect is completely lost, and power is just wasted. Furthermore, since the display element is designed so that its directional characteristics are concentrated in the front, there are problems in that the visibility of the displayed content from the lateral direction is poor, the display range is narrowed, and the display value is reduced accordingly.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a display unit that can obtain a high visibility effect at a wide angle even during the day when sunlight is strong.

[Means for solving problems]

For this purpose, the present invention provides one of the matrix display devices.
A display unit that constitutes a display unit, in which a plurality of light emitting diodes of a mixture of red and other colors are arranged vertically and horizontally on a mounting base of one display unit, and above the rows of light emitting diodes lined up in the horizontal direction. It is characterized by the installation of louvers that block sunlight.

[Effect]

In the display unit of the present invention, the fins that block sunlight are provided above the rows of display elements arranged in the horizontal direction, so even during the day when the sunlight is strong, the display elements are in the shade of the louver and do not block sunlight. Because the light does not hit the light, the contrast between lighting and turning off becomes stronger, increasing visibility. In particular, if the louver is black or a dark color close to black, and only the bottom surface is glossed, there will be less sunlight reflection and the reflected light of the display element will be directed downward, making it highly visible when the display element is turned on/off. Therefore, the display effect can be enhanced.

〔Example〕

Examples will be described below with reference to the drawings.

FIG. 1 shows one of the matrix display devices according to the present invention.
Figure 2 shows an example of a display unit frame and louver that constitute one dot display unit with a plurality of display elements, and Figure 3 shows an example of a display device configured by arranging display units. FIG.
In the figure, 1 is a matrix display device, 2, 3 and 12 are louvers, 4, 22 and 23 are display elements, 11 is a base, 13 is a display element mounting hole, 14 is a base mounting hole, 21 is a display unit, and 24 is a The display unit mounting surface is shown.

In FIG. 1, a matrix display device 1 has a plurality of display elements 4 arranged in a matrix, and each display element 4 constitutes a one-dot display unit. Therefore, by controlling the display so that the display elements 4 form a group of, for example, 12 x 12 or 24 x 24, one group can display 12
It is also possible to display ×12 dots or 24 × 24 characters, or to display pictures, patterns, and animations using all display elements 4. As the display element 4, a light emitting diode (LED), a discharge lamp, or the like is used.
The louvers 2 and 3 are provided above the horizontally arranged display elements 4 to block sunlight, as shown in the side view of FIG. It is better to process it. When the upper surface of the louver 3 is glossed, sunlight is reflected on the upper surface and hits the display element, which weakens the contrast between lighting and turning off. However, by glossing only the lower surface, the reflection of sunlight from the upper surface of the louver 3 to the display element 4 above is reduced, and the light when the display element 4 is turned on is reflected downward. If the installation location is high, the display effect can be enhanced.

In the above example, 1 dot display unit (1 pixel) is
The display unit shown in FIG. 2 constitutes a display unit (pixel) corresponding to the display element 4, and has a plurality of light emitting elements (light emitting diodes) arranged vertically and horizontally. together constitute one display unit. The example shown in Figure 2 is 4×
This is a display unit frame that uses four display elements to constitute one dot display unit, and in particular, the louver 12
It is characterized by being tilted downward as shown in Figure b.

Generally, large displays are installed outdoors at a high location, and the display surface is rarely below eye level. In other words, it is extremely rare that the display is visible above the display, and is almost always visible from below. On the other hand, if the pitch between display elements is shortened as much as possible and the display elements are arranged closely, detailed display becomes possible and the image quality and content of the display can be enhanced. The installation space will be limited. If the pitch between the display elements is set to the amount necessary for attaching the louvers 12, the display elements and the louvers 12 will be too close together, and the light from the display elements will be blocked by the louvers 12 below, causing the light to flow downward. A problem arises in that the viewing angle becomes narrower. In such a case, the position of the louver 12 must be structurally centered on the pitch of the display element mounting hole 13, but if the louver 12 is tilted downward as shown in Figure b, the display element and its Lower louver 1 in relation to lower louver 12
The amount of light blocked by 2 is reduced, and the display effect for the downward direction can be improved. Note that the present invention can be similarly applied even when the pitch between the display elements is long, and in such a case, the louver 12 may be arranged below the center of the pitch between the display elements. Furthermore, as a method of widening the downward viewing angle, the display unit 21 may be tilted downward with respect to the display unit mounting surface 24, as shown in FIG.

By the way, when a light emitting diode is used as a display element, a red element is generally used, but there is a problem that red is harsh on the eyes. To improve this problem, for example, in FIG. 3, it is possible to create an orange display color by using a yellow or yellow-green element for the display element 22 and a red element for the display element 23. can. In this case, red has high visibility in sunlight, but colors other than red have poor visibility in sunlight, so elements of different colors are arranged alternately or staggered as shown in the figure. This results in a display color close to red in sunlight, which can improve visibility.

Figure 4 shows an example of a display element that improves lateral visibility, Figure 5 shows an example of a display unit that improves lateral visibility, and Figure 6 shows an example of a display unit that improves lateral visibility. FIG. 7 is a diagram showing an example of the mounting height of the display element to be improved, and FIG. 7 is a diagram showing an example of mounting the display element in the display unit. In the figure, 31 is a package (case), 32 is a display element body, 33, 3
5 and 45 are lead terminals, 34 and 43 are display elements,
41 is a base, 42 is a louver, 44 is a light emitting surface,
46 is a enclosure, 47 is a substrate, 48 is a resin, 49 is a display element mounting hole, and 50 is a display unit mounting hole.

Although the downward viewing angle can be widened by providing the louver as described above, the display device having the configuration shown in FIGS. 1 to 3 has a problem in that the horizontal viewing angle is narrow. FIGS. 4 to 6 show examples of improving such problems.

In the example shown in FIG. 4, the package (case) 3 of the display element is
1. As the package 31, a case made of plastic, for example, is generally used. A conventional display element package has a cylindrical shape with a spherical tip, as shown in the display element of FIG. 5, for example. This is to obtain high brightness in the front direction. That is, in the case of illumination, lighting effects are required at a wide angle, but display elements are usually required to have visibility from the front. The shape is such that the light is emitted in the front direction due to reflection, etc. In this regard, in the display element shown in FIG. 4, the front of the package 31 is not spherical but rather has a slightly flattened shape. By doing this, the angle of incidence of the light emitted from the light source in the lateral direction (diagonally forward) and hitting the inner wall of the package 31 is increased, increasing the transmissivity of the light in the lateral direction, and the reflected light is also reflected in the front direction. Since the light can be directed to the opposite side without any problems, the amount of light emitted in the lateral direction can be relatively increased.

Furthermore, the example shown in Fig. 5 shows an example of improvement by arranging display elements in a display unit. For example, when arranging a plurality of display elements by resin molding, it is possible to move the central display element to the front. , the position of the surrounding display elements backwards, i.e.
This is a spherical arrangement. In this way,
The amount of emitted light in the lateral direction (diagonally forward direction) can be increased compared to arranging a plurality of display elements on the same plane. Of course, the display elements shown in FIG. 4 may be used as individual display elements in this embodiment.

Furthermore, FIG. 6 shows an example in which the amount of radiated light in the lateral direction is ensured by adjusting the mounting height when the display element is mounted on the base. In the example shown in FIG. 6, the light emitting surface 44 of the display element 43 is positioned higher than the surface of the mounting base 41. When the light emitting surface 44 of the display element 43 is located deeper than the surface of the mounting base 41, part of the lateral light emitted from the light emitting surface 44 is blocked by the wall surface of the mounting hole of the base 41. Therefore, the amount of radiated light in the lateral direction is cut by that amount, but if the light emitting surface 44 is positioned higher than the surface of the base 41 as shown in the figure, the light radiated in the lateral direction from the display element 43 is still emitted as is. It turns out.

When the display unit as described above is used outdoors, it can be molded with silicone resin, fluororesin, or other resin 48 as shown in FIG. 7 to provide a waterproof structure. FIG. 7a is a cross-sectional view of the display element 43 attached to the base 41 described in FIG. 2 and with the back side molded,
For example, the board 47 is screwed to a mounting post protruding from the back side of the base 41, and the board 47 and the base 4 are connected together.
1 and the upper surface of the substrate 47 are molded. Figure b shows the back view of the base 41, and the base 41 has enclosures 46 on three sides.
By providing this, it is made easier to mold.

Note that the present invention is not limited to the above embodiments, and various modifications are possible. For example, in the above embodiment, a light emitting diode is used as the display element, but it goes without saying that a discharge lamp or other light source may be used.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, a plurality of light emitting elements (light emitting diodes) of a mixture of red and other colors are arranged vertically and horizontally on a mounting base for one dot display unit ( 1 pixel), improving day and night visibility.
Furthermore, since the plurality of light emitting diodes can be replaced on a base-by-base basis, attachment and detachment can be easily performed. Moreover, since the louver is provided above the display elements arranged in the horizontal direction so as to block sunlight, visibility can be improved even under sunlight. Furthermore, since the amount of emitted light in the lateral direction is increased, the viewing angle as a display device can be increased.

[Brief explanation of the drawing]

FIG. 1 shows one of the matrix display devices according to the present invention.
Figure 2 shows an example of a display unit frame and louver that constitute one dot display unit with a plurality of display elements, and Figure 3 shows an example of a display device configured by arranging display units. Figure 4 shows an example of a display element that improves lateral visibility, Figure 5 shows an example of a display unit that improves lateral visibility, and Figure 6 shows an example of a display element that improves lateral visibility. FIG. 7 is a diagram showing an example of mounting height of a display element to improve visibility, and FIG. 7 is a diagram showing an example of mounting a display element in a display unit. 1... Matrix display device, 2, 3 and 12...
Louver, 4, 22 and 23...Display element, 11...
...Base, 13...Display element mounting hole, 14...
...Base mounting hole, 21...Display unit, 2
4...Display unit mounting surface.

Claims (1)

[Claims] 1. A display unit constituting one display unit of a matrix display device, which comprises a plurality of light emitting diodes of a mixture of red and other colors arranged vertically and horizontally on a mounting base of one display unit. A display unit characterized in that a louver for blocking sunlight is provided above each row of light emitting diodes arranged in a horizontal direction. 2. The display unit according to claim 1, characterized in that red light emitting diodes are arranged in a staggered manner. 3. The display unit according to claim 1, wherein the display unit has a waterproof structure by filling the back side with resin and molding it.